For 2018 I am once again looking to supplement my full range stereo setup with a fast, articulate subwoofer that blends nicely with Classe/B&W. Looking at HSU ULS-15, Rythmik Audio L12 Servo, REL T5i, and SVS SB-2000. Budget is around $850, and a sealed enclosure with SQL over SPL is my preference. Any experience with these subs among the group? Already purchased the ULS-15 MK2 and SVS SB-2000 for in-home trial, but not sure if I should pursue the REL or Rythmik. The Rythmik is appealing due mostly to it's price and great reviews, otherwise I am not sure it could compete with the others, especially in terms of subsonic output. Obviously the REL won't come close to the 15', but I have heard the T7i and was surprised at how seamlessly it blended with the mains and how musical it was. 2 channel music will be the sole application for whichever sub wins out.

Thank you so much for deciding to try out our ULS-15 MK2! I'm not very familiar with the subs listed. However, I do know that all the companies listed build great subs, so I don't think you can go wrong either way. We certainly design all of our subs to be very musical. For the SB-2000, I can only go off of measurements provided by Audioholics. It features a 12" driver with a 500w RMS amp in roughly a 14.6" x 14.2" x 15.4" enclosure. It's frequency response is 220-19 Hz +/- 3 dB. According measurements reported by audioholics, the sub measures about 117.8 in the mid bass and 106.3 dB in the deeper bass. The ULS-15 MK2 measures about 125 dB in the mid-bass and 112.9 dB in the deeper bass (using our measurements which are slightly lower than that reported by AH) and plays from 220-18/17 Hz +/-3 dB. Note that coming from different sources, there can be some slight deviations due to the environment tested, but it does give you a pretty good idea as to the differences. The REL has an 8" sealed box with a 125 w RMS amp, so it likely won't give you as much clean output or extension as either the SB-2000 or ULS-15 Mk2. The L12 is a 12" w/ a 300w amp, so it may not play as loud or as clean either, but it does come with servo tech built in. Again I haven't had much experience with any of those subs so I can't really comment on them definitively. Our ULS-15 Mk2 is reviewed highly for both music and home theater.

Thank you Kevin for the info and positive remarks for the other companies. I agree that the specs and design for the Hsu are compelling and were enough for me to purchase the Hsu first off. I have the highest expectations for this sub in terms of, well, everything pretty much. Hsu is a company highly regarded for being musical and I am really looking forward to giving it an audition. My only concerns were getting a sub that is over-spec'd for the system and volume levels for my listening area. But, if this sub works great at low-mid volume levels and integrates seamlessly, it will be extremely difficult for any other sub in its range to supplant.

The sub should work pretty well for low-mid volumes. Our ears are pretty sensitive to changes in level with bass so at lower levels, the bass may seem lower in the mix. That's why many receivers come with adaptive EQ to boost the bass and treble at lower levels to compensate.

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